这是某参考文献中附录的编程,是求混合模型中的随机参数值,其中Za1和Za2不知是什么,也不知道怎么求的,求好心人帮帮忙,万分感谢!!!!
%let n=2; /*n=number of tress used for calibration*/
Data example;
Input d h ddom hdom weight;/*weight=242.87/(area of the subplot), in the case of unequal selection probabilities;weight=1, in other case*/
H=1.3+(ht-1.3)*(exp(-7.914*d**(-1.444+0.02259*(ht-1.3)))/exp(7.914*dg**(-1.444+0.02259*(ht-1.3))));
Cards;
9 11 18 18 3.092
9.5 12 18 18 3.092
10 . 18 183.092
13 . 18 18 0.7731
15 . 18 18 0.7731
18 . 18 180.7731
;
Run;
Data calibration;
Set example;
Res=h-hhat;
B0=-7.914*d**(-1.444+0.02259*(ht-1.3));/*auxiliaryvariable*/
B1=-7.914*dg**(-1.444+0.02259*(ht-1.3));/*auxiliary variable*/
Za1=(ht-1.3)*exp(b0)*(b0*log(d)-b1*log(dg))/exp(b1);
Za2=(ht-1.3)**2*exp(b0)*(b0*log(d)-b1*log(dg))/exp(b1);
W=(1/weight)**0.5;
Where h is not null;
Run;



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